I use a Rigid trim router, which has less power than the 611, to freehand rout the waste from through and lapped pin boards with a spiral bit, and it’s got plenty of power. Before I had the trim router, I used the 611 to do the same. I cut the tails on my table saw.

If you’re going to do it with something like a Leigh D4R, which is how I used to do it, you’re better off with a larger router that can handle 1/2” bits. Most Leigh bits have 8mm shanks, which have to go into a 1/2” collet with an adapter, and don’t fit in a 1/4” shank. Also, the smaller routers may suffer from clearance problems with a guide bushing installed.

If everything fits, I think the 611 would have plenty of power, as you can control the amount you are cutting, but a larger router would provide reserve power for those times you want to go straight through to the back and back out, to limit chipout. I also think a 611 might have problems with sliding dovetails. Larger routers have more mass in the motor, and bigger support bearings, which will avoid potential vibrations and inaccuracy during heavy cuts.